Ingredients

Preparation

Mix first 5 ingredients in jar. Place lid on jar; shake to combine. Add oil. Replace lid; shake. Season with salt and pepper. DO AHEAD: Can be made 3 days ahead. Keep chilled. Bring to room temperature before using.

Shake vinaigrette to blend. Trim ends of romaine, then slice lengthwise. Arrange on plates and drizzle with vinaigrette.